There's a variety of routes, depending on where you want to go and how long you want it to take.
We went out of ATL up through...I think it was the "40 route?" Chattanooga, Ky., Mo., Ill., Wyo., etcetc.
Nearly 3,000 miles. I think. That might have been the final count, including the return drive.
Terribly scenic. We (eight of us) were on a short bus (a-hardy har har) with a trailer. We took other people's stuff, who flew, so that is another option (driving yourself there, having someone else haul your stuff).
If it is just two of you, the vehicle depends on your space needs. And whether you want it on the playa.
I thought you had to be 25 everywhere, to rent a car.
You really oughta start hanging out with the ATL burners...they have loads of experience! Play in the Hood is most Sundays @ Colaboratory (where Decomp and a NYE show were held this year).
ETA: Also, if you drive, be very, VERY prepared to stay nowhere on schedule, and spend a loooot more money than you planned on.
Our trip took almost two days longer, and included (among other delights) a night spent in a tire repair shop's parking lot.